A method of using red mud to produce aerated blocks

Abstract

The invention provides a method for producing an air entrapping building block by utilizing red mud, comprising the following steps: mixing the following raw materials (dry basis) by weight part: 50-70 parts of red mud, 5-10 parts of calcium oxide and 20-40 parts of active gelled material; adding water according to 85-100 percent of the dry basis mass of the mixture, adding aluminium powder according to 0.04-0.06 percent of the dry basis mass of the mixture and adding an auxiliary agent according to 0.5-0.8 percent of the dry basis mass of the mixture; mixing to prepare a sizing agent; and finally obtaining the air entrapping building block through foaming, standing and steam curing. The air entrapping building block has the advantages of stable physical properties, light weight, good heat-insulation property, high waste use ratio, simple process, low cost, environmental protection, natural resource saving and the like, and can be used as non-load bearing partitions of urban high-risebuildings and as heat-insulation building blocks of low-temperature warehouses, heat-insulation warehouses and cold storage warehouses of industrial equipment.

Description

technical field [0001] The invention relates to a method for producing an aerated block by using red mud, and belongs to the technical field of resource comprehensive utilization and new building materials. Background technique [0002] Red mud is the solid waste slag discharged during the alumina production process. When alumina is produced by the sintering method, Bayer method and hybrid method of the prior art, solid waste slag-red mud will be discharged, but it will vary depending on the specific alumina production method. Different from the quality of bauxite, the chemical composition, physical properties and mineral structure of red mud are different. Because of the high iron oxide content in it, its appearance color is similar to laterite, so it is generally called red mud. [0003] my country is the fourth largest producer of alumina in the world. Every ton of alumina produced produces about 1.5 tons of red mud (dried), and each ton of dried red mud also comes with 3...

AI Technical Summary

Problems solved by technology

[0009] In summary, there have been reports of using red mud as auxiliary raw material to produce cement, wall bricks, and road materials, but there has been no report of using red mud as the main raw material for the production of aerated blocks.